Information – UL Class 1 Division 2
Nonincendive Field
Wiring Apparatus
Relationship
Associated Field
Wiring Apparatus
1
Vmax (or Ui)
>=
Voc (or Vt (or Uo)
2
Imax (or Ii)
>=
Isc or It (or Lo)
3
Pmax
>=
Po
4
Ci + Ccable
<=
Ca (or Co)
5
Li + Lcable
<=
La (or Lo)
The following are UL limitations for the application of customer I/O wiring to
the indicated B+B products. These limitations involve the maximum inductance,
capacitance and resistance that may be connected to I/O lines, current and
power maximums that can be drawn from the I/O lines, and the maximum output
voltage from the I/O lines.
Customer I/O wiring is on the left; the B+B product is on the right in the drawing
below:
Nonincendive Field Wiring Apparatus Control
Drawing
(Document # 260-10194-00)
Table 1: Nonincendive Field Wiring Apparatus vs. Associated Field
Wiring Apparatus per UL Limitations
The following notes are pertinent to Class I, Division 2 applications:
a. Associated apparatus output current must be limited by a resistor such that the output
voltage-current plot is a straight line drawn between open-circuit voltage and short-circuit
current.
b. [Optional] The Nonincendive Field Wiring device does not provide 500 V isolation with
respect to earth. Associated apparatus used must be galvanically isolated or dual channel
shunt zener diode barriers with linear outputs used channel to channel.
c. Associated apparatus may be in a Division 2 or Zone 2 location if so approved.
d. Selected associated apparatus must be third party listed as providing Nonincendive
Field Wiring circuits for the application, and have Voc or Vt not exceeding Vmax (or Uo
not exceeding Ui), Isc or It not exceeding Imax (or Io not exceeding Ii), and the Po of the
associated apparatus must be less than or equal to the Pmax or Pi of the Nonincendive Field
Wiring equipment, as shown in Table 1.
e. Capacitance and inductance of the field wiring from the Nonincendive Field Wiring
equipment to the associated apparatus shall be calculated and must be included in the
system calculations as shown in Table 1. Cable capacitance, Ccable, plus Nonincendive
Field Wiring equipment capacitance, Ci, must be less than the marked capacitance, Ca (or
Co), shown on any associated apparatus used. The same applies for inductance (Lcable, Li
and La or Lo, respectively). Where the cable capacitance and inductance per foot are not
known, the following values shall be used: Ccable = 60 pF/ft., Lcable = 0.2 µH/ft.
f. Associated apparatus must be installed in accordance with its manufacturer’s control
drawing and Article 504 of the National Electrical Code (ANSI/NFPA 70) for installation in
the United States, or Section 18 of the Canadian Electrical Code for installations in Canada.
g. When required by the manufacturer’s control drawing, the associated apparatus must
be connected to a suitable ground electrode per the National Electrical Code (ANSI/NFPA
70), the Canadian Electrical Code, or other local installation codes, as applicable. The
resistance of the ground path must be less than 1 ohm.
h. Associated apparatus must not be used in combination unless permitted by the associated
apparatus certification.
i. Control equipment must not use or generate more than 250 V rms or dc with respect to
earth.
j. The WSB-XMXX and WSD-XMXX are provided with a permanently connected cable
having the following characteristics:
(Following are some characteristics that should be considered for inclusion. In general, as
much information as possible should be included.
Type
Rated Voltage
Rated Current
Maximum Rated Temperature
Conductor size
Insulation type
Insulation thickness
Certifications)
k. Suitability for installation in particular applications is at the discretion of the Authority
Having Jurisdiction (AHJ).
2. Nonincendive Field Parameters for DIGITAL OUTPUTS (DO). Customer’s attached
equipment (apparatus) cannot exceed each of these values.
Parameter
Value
Definitions – all refer to B+B product DO lines (TB1)
1
Voc
30 Vdc
Maximum output voltage that can be applied by the
DO lines to customer’s equipment with suitable load
that limits current (note b)
2
Isc
100 mA
Maximum output current that DO lines can supply to
the customer’s equipment
3
Ca
0.1 uF
Maximum external capacitance that the B+B DO lines
shall present to customer’s equipment
4
La
5 mH
Maximum external inductance that the B+B DO lines
shall present to customer’s equipment
5
Po
3.0 w
Maximum output power that DO lines shall supply to
customer’s equipment
– note b
b. Since the Digital Output is an open FET drain, customer will attach a voltage source
(30 Vdc max) through a load that will limit current to 100 mA maximum. A typical
load would thus be R = E/I = 30v/0.1A = 300 ohms. This load is in series with the FET
(source-to-drain). Since the Ron of the FET is 1 ohm max, over 99% of the voltage drop
will be across the customer load, <1% will be across the FET. The power dissipated in the
FET will in this case be P = I**2 x R = (0.1A)**2 x 1 ohm = 10 mW.
3. Nonincendive Field Parameters for 3.3V REF port. Customer’s attached equipment
(apparatus) cannot exceed each of these values.
Parameter
Value
Definitions – all refer to B+B product 3.3V REF (TB1)
1
Vmax
5 VDC
Maximum input voltage that can be applied to the
3.3V REF line
2
Imax
7 mA
Maximum input current that customer’s equipment
can draw from the 3.3V REF line.
3
Ci
10.11 uF
Maximum capacitance that customer’s equipment
shall present to the B+B 3.3V REF line.
4
Li
0 mH
Maximum inductance that customer’s equipment
shall present to the B+B 3.3V REF line.
5
Pmax
35 mW
Maximum power that customer’s equipment shall
draw from 3.3V REF line.
(3.3v x 0.007a)
NOTE 1:
a. Suitability for installation in particular applications is at the discretion of the Authority
Having Jurisdiction (AHJ)
4. Nonincendive Field Parameters for ANALOG INPUT ports in Voltage-Input mode
(AI-V). Customer’s attached equipment (apparatus) cannot exceed each of these values.
Parameter
Value
Definitions – all refer to B+B product AI Ports in
Voltage mode
1
Vmax
5 VDC
Maximum voltage that can be applied to the AI
Ports in Voltage mode
2
Imax
1 uA
Maximum input current that customer’s equipment
can draw from the B+B AI Ports in Voltage mode
3
Ci
0.01 uF
Maximum capacitance that customer’s equipment
shall present to the B+B AI Ports in Voltage mode
4
Li
0 mH
Maximum inductance that customer’s equipment
shall present to the B+B AI Ports in Voltage mode
5
Pmax
5 uW
Maximum power that customer’s equipment shall
draw from B+B AI Ports in Voltage mode
(5v x 1uA)
a. Suitability for installation in particular applications is at the discretion of the Authority
Having Jurisdiction (AHJ)
5. Nonincendive Field Parameters for ANALOG INPUT ports in Current-Loop mode
(AV-I). Customer’s attached equipment (apparatus) cannot exceed each of these values.
Parameter
Value
Definitions – all refer to B+B product AI Ports in
Current-Loop mode
1
Vmax
5 VDC
Maximum voltage that can be applied to the AI Ports
in Current-Loop mode
2
Imax
20 mA
Maximum input current that customer’s equipment
can supply to the B+B AI Ports in Current-Loop mode
3
Ci
0 uF
Maximum capacitance that customer’s equipment
shall present to the B+B AI Ports in Current-Loop
mode
4
Li
0 mH
Maximum inductance that customer’s equipment
shall present to the B+B AI Ports in Current-Loop
mode
5
Pmax
100 mW
Maximum power that customer’s equipment shall
draw from B&B AI Ports in Current-Loop mode
(5v x 20 mA)
a. Suitability for installation in particular applications is at the discretion of the Authority
Having Jurisdiction (AHJ)
a. Suitability for installation in particular applications is at the discretion of the Authority
Having Jurisdiction (AHJ)
Table 2: Product DO Lines (TB1)
Table 3: 3.3V REF (TB1)
Table 4: AI Ports in Voltage Mode
Table 5: AI Ports in Current-Loop Mode
Wzzard Intelligent Edge Nodes
1. SUITABLE FOR USE IN CLASS I,
DIVISION 2, GROUPS A, B, C AND D HAZARDOUS LOCATIONS, OR
NONHAZARDOUS LOCATIONS ONLY.
2.
WARNING - EXPLOSION HAZARD
SUBSTITUTION OF ANY
COMPONENT MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION 2.
3.
WARNING - EXPLOSION HAZARD
DO NOT DISCONNECT
EQUIPMENT WHILE THE CIRCUIT IS LIVE OR UNLESS THE AREA IS
KNOWN TO BE FREE OF IGNITABLE CONCENTRATIONS.
4. The unit is to be connected to a Class 2 power source via the terminal
block.
5. Field wiring conductor minimum insulation rating - 80°C.
6. Use Copper Conductors Only or equivalent.
7. See Instruction Manual for additional information.
Batteries
1.
Warning
: Risk of Fire and Burns. Do Not Recharge, Open, Crush, Heat
Above 100°C, or Incinerate the batteries.
2. Batteries are not user replaceable, only a qualified technician should
replace the batteries.
